<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>03_浮动小练习</title>
    <style>
        .outer {
            width: 250px;
            border: 2px  solid  grey;
            
        }
        .box {
            width: 100px;
            height: 100px;
            background-color: skyblue;
            border: 2px solid  black;
            margin: 10px;
          
            
        }
        .one {
            float: left;
            height: 130px;

        }
        .two {
            float: left; 
        }
        .three {
            float: left;  
        }
    </style>
</head>
<body>
    <div class="outer">
        <div class="box one">1</div>
        <div class="box two">2</div>
        <div class="box three">3</div>
    </div>
    
</body>
</html>